BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CURRENT ASSETS
Accounts receivable, less reserve of $3.7 and $1.6, respectively	$ 182.4	$ 142.3
Accrued unbilled revenues	59.3	56.8
Advances to parent	97.2	68.9
Fuel inventories	76.9	134.9
Materials and supplies, at average cost	81.1	77.1
Gas imbalances	0	0.1
Deferred income taxes	10.3	10.7
Fuel clause under recoveries	1.8	1.0
Other	28.0	20.4
Total current assets	537.0	512.2
OTHER PROPERTY AND INVESTMENTS, at cost	2.7	2.9
PROPERTY, PLANT AND EQUIPMENT
In service	7,808.8	7,043.6
Construction work in progress	334.4	328.1
Total property, plant and equipment	8,143.2	7,371.7
Less accumulated depreciation	2,592.3	2,494.4
Net property, plant and equipment	5,550.9	4,877.3
DEFERRED CHARGES AND OTHER ASSETS
Regulatory assets	507.9	489.4
Other	22.4	16.3
Total deferred charges and other assets	530.3	505.7
TOTAL ASSETS	6,620.9	5,898.1
CURRENT LIABILITIES
Accounts payable - affiliates	1.3	4.4
Accounts payable - other	193.4	144.1
Customer deposits	65.7	63.2
Accrued taxes	33.5	31.2
Accrued interest	43.2	41.6
Accrued compensation	26.6	22.2
Price risk management	2.2	1.3
Fuel clause over recoveries	7.7	29.9
Other	56.5	40.3
Total current liabilities	430.1	378.2
LONG-TERM DEBT	2,039.2	1,790.4
DEFERRED CREDITS AND OTHER LIABILITIES
Accrued benefit obligations	230.8	259.8
Deferred income taxes	1,146.0	1,055.3
Deferred investment tax credits	6.1	9.4
Regulatory liabilities	230.7	193.1
Price risk management	1.8	2.2
Other	42.2	31.6
Total deferred credits and other liabilities	1,657.6	1,551.4
Total liabilities	4,126.9	3,720.0
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDER'S EQUITY
Common stockholder's equity	1,011.4	958.4
Retained earnings	1,485.1	1,221.8
Accumulated other comprehensive loss, net of tax	(2.5)	(2.1)
Total stockholder's equity	2,494.0	2,178.1
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 6,620.9	$ 5,898.1